Rotor-stator axial air moving device

ABSTRACT

A rotor-stator axial air moving device includes a housing, a rotor, and a stator. The rotor and the stator are disposed in the housing. The rotor includes a rotor hub and multiple rotor blades. The stator includes a stator hub and multiple stator blades. Each stator blade includes a blade root and a blade tip. The pitch angle is defined between the nose-tail line of wing section and a rotation direction of the axial air moving device. The pitch angles from the blade root to the blade tip of the wing section of each stator blade are configured in a manner of gradually increasing and then gradually decreasing.

BACKGROUND OF THE DISCLOSURE Technical Field

The technical field relates to an air moving device for cooling, andmore particularly relates to a rotor-stator axial air moving device witha stator blade structure.

Description of Related Art

In order to enhance the operation efficiency of the air moving devicefor cooling, the air moving devices may be disposed with a plurality ofstator blades connected to the hub and the housing to configure arotor-stator air moving device to improve the static pressure-airflowrate characteristics of the air moving device and effectivelyovercome the flow resistance of the environment.

As shown in FIG. 1 , the rotor-stator air moving device of the relatedart includes a housing 10 a, a rotor 20 a and a stator 30 a bothdisposed in the housing 10 a. The stator 30 a includes a stator hub 31 aand a plurality of stator blades 32 a arranged annularly and spacedly.In addition, the stator blades 32 a of the rotor-stator air movingdevice of the related art has a pitch angleθ₁ on the wing section BA atdifferent radius positions. The pitch angle is defined between thenose-tail line LA of the wing section and the rotation direction u ofthe air moving device. Moreover, the distribution of the pitch angle ofthe stator blades 32 a of the rotor-stator air moving device of therelated art is smooth. Generally speaking, as shown in the FIG. 2 , themaximum pitch angle is located at the blade root 321 a (the spanposition is defined as 0) of the stator blade 32 a, and then the pitchangle is gradually decreased toward the blade tip 322 a (the spanposition is defined as 1).

However, due to the emphasis on energy efficiency in recent years, inthe design of air moving devices, in addition to improving theperformance of air pressure and air flowrate, how to improve theoperation efficiency has gradually become an important topic.Accordingly, how to improve the operation efficiency of the rotor-statorair moving devices as to achieve the energy saving are the researchmotivation of the disclosure.

SUMMARY OF THE DISCLOSURE

One object of this disclosure is to provide a rotor-stator axial airmoving device with a stator blade structure, which the design of thestator blade structure may improve the efficiency of the rotor-statoraxial air moving device to achieve the effect of energy saving.

In order to achieve the object mentioned above, this disclosure providesa rotor-stator axial air moving device including a housing, a rotor, anda stator. The rotor and the stator are disposed in the housing. Therotor includes a rotor hub and a plurality of rotor blades. The statoris located on the downstream side of the rotor. The stator includes astator hub and a plurality of stator blades. Each stator blade includesa blade root connected to the stator hub and a blade tip located awayfrom the stator hub. Each stator blade is configured by multiple wingsections being stacked continuously, and the pitch angle is definedbetween a nose-tail line of the wing section and the rotation directionof the axial air moving device. The pitch angles from the blade root tothe blade tip of the wing section of the stator blade are configured ina manner of gradually increasing and then gradually decreasing.

The pitch angles from the blade root to the blade tip of the statorblade structure of the rotor-stator air moving device of this disclosureare configured in a manner of gradually increasing and then graduallydecreasing. Comparing with the rotor-stator axial air moving device ofthe related art, the rotor-stator axial air moving device of thisdisclosure may improve the P-Q performance curve and enhance theefficiency of the axial air moving device with the aforementioned statorblade structure. Therefore, the effect of energy saving may be achieved,and the practicability of this disclosure may be increased.

BRIEF DESCRIPTION OF DRAWINGS

The features of the disclosure believed to be novel are set forth withparticularity in the appended claims. The disclosure itself, however,may be best understood by reference to the following detaileddescription of the disclosure, which describes a number of exemplaryembodiments of the disclosure, taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a cross sectional view of the rotor-stator axial air movingdevice in the related art.

FIG. 2 is a curve diagram of the distribution of pitch angle of thestator blade of the rotor-stator axial air moving device in the relatedart.

FIG. 3 is a perspective exploded schematic view of the rotor-statoraxial air moving device in this disclosure.

FIG. 4 is a planar view of the assembly of the housing and the stator inthis disclosure.

FIG. 5A is a schematic view of the blade angle of the stator blade nearthe blade root in this disclosure.

FIG. 5B is a schematic view of the blade angle between the blade rootand the blade tip of the stator blade in this disclosure.

FIG. 5C is a schematic view of the blade angle near the blade tip of thestator blade in this disclosure.

FIG. 6 is a curve diagram of the distribution of pitch angle of thestator blade in this disclosure.

FIG. 7 is a comparison diagram of the P-Q performance curve of therotor-stator axial air moving device in this disclosure and the relatedart.

FIG. 8 is a comparison diagram of the efficiency curve of therotor-stator axial air moving device in this disclosure and the relatedart.

FIG. 9 is a perspective exploded schematic view of the rotor-statoraxial air moving device of another embodiment in this disclosure.

FIG. 10 is a planar view of assembly of the housing and the stator ofanother embodiment in this disclosure.

FIG. 11A is a schematic view of the blade angle near the blade root ofthe stator blade of another embodiment in this disclosure.

FIG. 11B is a schematic view of the blade angle between the blade rootand the blade tip of the stator blade of another embodiment in thisdisclosure.

FIG. 11C is a schematic view of the blade angle near the blade tip ofthe stator blade of another embodiment in this disclosure.

FIG. 12 is a curve diagram of the distribution of pitch angle of thestator blade of another embodiment in this disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical contents of this disclosure will become apparent with thedetailed description of embodiments accompanied with the illustration ofrelated drawings as follows. It is intended that the embodiments anddrawings disclosed herein are to be considered illustrative rather thanrestrictive.

Please refer to FIG. 3 and FIG. 4 , which respectively depict aperspective exploded schematic view of the rotor-stator axial air movingdevice in this disclosure and a planar view of assembly of the housingand the stator in this disclosure. The rotor-stator axial air movingdevice 1 of this disclosure includes a housing 10, a rotor 20 and astator 30. The rotor 20 and the stator 30 are combined in the housing10. The stator 30 is disposed on the downstream side of the rotor 20 toconstitute the rotor-stator axial air moving device 1.

The housing 10 is a frame base and has an accommodating space 100. Therotor 20 is disposed in the housing 10. The rotor 20 includes a rotorhub 21 and a plurality of rotor blades 22 arranged annularly andspacedly on the periphery of the rotor hub 21. In addition, the stator30 is disposed in the housing 10 and located on the downstream side ofthe rotor 20. The stator 30 includes a stator hub 31 and a plurality ofstator blades 32 arranged annularly and spacedly.

In this embodiment, the stator hub 31 is a cylinder. The stator blades32 are arranged on the periphery of the stator hub 31, and the statorblades 32 are connected to the inner wall of the housing 10.Furthermore, the pitch angle direction of the stator blade 32 isopposite to that of the rotor blade 20.

Specifically, each of the stator blades 32 includes a blade root 321connected to the stator hub 31 and a blade tip 322 located away from thestator hub 31. Moreover, each of the stator blades 32 is configured bystacking multiple wing sections continuously. Please refer to FIG. 4 ,in this embodiment, the cross-sectional views of the wing sections areprovided at three positions including the position at the blade root,the position between the blade root and the blade tip, and the positionat the blade tip of the stator blade 32.

Please further refer to FIG. 5A to FIG. 5C and FIG. 6 , theyrespectively depict schematic views of the blade angle near the bladeroot, between the stator blade and the blade root, and near the bladetip of the stator blade in this disclosure, and a curve diagram of thedistribution of pitch angle of the stator blade in this disclosure. Eachof the stator blades 32 is configured by stacking multiple wing sectionscontinuously. It should be noted that, the pitch angle is definedbetween the nose-tail line of the wing section each and the rotationdirection u of the rotor-stator axial air moving device 1.

FIG. 5A shows that the pitch angleθ2 formed by the nose-tail line LB ofthe wing section BB near the blade root 321 and the rotation direction uof the rotor-stator axial air moving device 1 is about 51.209 degrees.In addition, FIG. 5B shows that the pitch angleθ3 formed by thenose-tail line LB of the wing section BB between the blade root 321 andthe blade tip 322 and the rotation direction u of the rotor-stator axialair moving device 1 is about 52.670 degrees. Moreover, FIG. 5C showsthat the pitch angleθ4 formed by the nose-tail line LB of the wingsection BB near the blade tip 322 and the rotation direction u of therotor-stator axial air moving device 1 is about 42.833 degrees. From theabove, the maximum pitch angle of the stator blade 32 is located betweenthe blade root 321 and the blade tip 322.

As shown in FIG. 6 , specifically, the pitch angles from the blade root321 to the blade tip 322 of the wing section of each stator blade 32 inthis disclosure have the trend of gradually increasing and thengradually decreasing. In some embodiments, the maximum pitch angle ofthe wing section of each stator blade 32 is located between the spanposition of about 0.15 and the span position of about 0.75. In thisembodiment, the maximum pitch angle of the wing section of the statorblade 32 is located at the span position of about 0.43 for about 54.060degrees.

It should be noted that the span position is defined as the positionradius (r) minus the radius of the blade root (Rr) and then divided bythe radius of the blade tip (Rt) minus the radius of the blade root(Rr). The formula is as follows. Accordingly, the span position at theblade root connected to the hub is defined as 0, and the span positionat the blade tip is defined as 1.

$\begin{array}{l}{\text{Span}\mspace{6mu}\text{position}\mspace{6mu}\text{=}} \\\frac{\left( {\text{position}\mspace{6mu}\text{radius}\mspace{6mu}\mspace{6mu}\left( \text{r} \right) - \text{radius}\mspace{6mu}\text{of}\mspace{6mu}\text{the}\mspace{6mu}\text{blade}\mspace{6mu}\text{root}\left( \text{Rr} \right)} \right)}{\left( {\text{radius}\mspace{6mu}\text{of}\mspace{6mu}\text{the}\mspace{6mu}\text{blade}\mspace{6mu}\text{tip}\left( \text{Rt} \right)\mspace{6mu} - \mspace{6mu}\text{radius}\mspace{6mu}\text{of}\mspace{6mu}\text{the}\mspace{6mu}\text{blade}\mspace{6mu}\text{root}\mspace{6mu}\left( \text{Rr} \right)} \right)}\end{array}$

Please refer to FIG. 7 and FIG. 8 , which respectively depict comparisondiagrams of the P-Q performance curve and the efficiency curve of therotor-stator axial air moving devices in this disclosure and the relatedart respectively. As shown in the figures, the operation area of therotor-stator axial air moving device of the related-art is mostlylocated on the right section of the curves. Furthermore, comparing withthe rotor-stator axial air moving device of the related art, therotor-stator axial air moving device of this disclosure has a better P-Qperformance curve and efficiency under the aforementioned stator bladestructure. That is, the stator blade structure of the rotor-stator axialair moving device of this disclosure may improve the P-Q performancecurve and enhance the efficiency of the axial air moving device.

Please further refer to FIG. 9 and FIG. 10 , they respectively depict aperspective exploded schematic view of the rotor-stator axial air movingdevice and a planar view of assembly of the housing and the stator ofanother embodiment in this disclosure. The rotor-stator axial air movingdevice 1 b includes a housing 10 b, a rotor 20 b and a stator 30 b. Therotor 20 b and the stator 30 b are combined in the housing 10 b. Thestator 30 b is disposed on the downstream side of the rotor 20 b. Thestator 30 b includes a stator hub 31 b and a plurality of stator blades32 b arranged annularly and spacedly.

It should be noted that the stator blade 32 b in this embodiment has aforward swept wing, but it is not limited thereto. This embodimentillustrates that the stator blade structure of this disclosure is notrestricted to have a specific swept wing.

Please refer to FIG. 11A to FIG. 11C and FIG. 12 , they respectivelydepict schematic views of the pitch angle near the blade root, betweenthe blade root and the blade tip, and near the blade tip of the statorblade of another embodiment in this disclosure, and a curve diagram ofthe distribution of pitch angles of the stator blade of anotherembodiment in this disclosure. FIG. 11A shows the pitch angleθ5 formedbetween the nose-tail line LC of the wing section BC near the blade root321 b of the stator blade 32 b and the rotation direction u of therotor-stator axial air moving device 1 b is about 47.478 degrees. Inaddition, FIG. 11B shows that the pitch angleθ6 formed between thenose-tail line LC of the wing section BC between the blade root 321 band the blade tip 322 b of the stator blade 32 b and the rotationdirection u of the rotor-stator axial air moving device 1 b is about54.792 degrees. Moreover, FIG. 11C shows the pitch angle67 formedbetween the nose-tail line LC of the wing section BC near the blade tip322 b of the stator blade 32 b and the rotation direction u of therotor-stator axial air moving device 1 b is about 46.589 degrees. Fromthe above, the maximum pitch angle of the stator blade 32 b is locatedbetween the blade root 321 b and the blade tip 322 b.

As shown in FIG. 12 , more specifically, the pitch angles from the bladeroot 321 b to the blade tip 322 b of the wing section of the statorblade 32 b of this disclosure have the trend of gradually increasing andthen gradually decreasing. In some embodiments, the maximum pitch angleof the wing section of the stator blade 32 b each is located between thespan position of about 0.15 and the span position of about 0.75. In thisembodiment, the maximum pitch angle of the stator blade 32 b is locatedat the span position of about 0.5 for about 53.590 degrees.

In summary, the pitch angles from the blade root to the blade tip of thestator blade structure of this disclosure have the trend of graduallyincreasing and then decreasing. In addition, comparing with therotor-stator axial air moving device of the related art, therotor-stator axial air moving device of this disclosure may improve theP-Q performance curve and enhance the efficiency of the axial air movingdevice under the aforementioned stator blade structure.

While this disclosure has been described by means of specificembodiments, numerous modifications and variations could be made theretoby those skilled in the art without departing from the scope and spiritof this disclosure set forth in the claims.

1. A rotor-stator axial air moving device, comprising: a housing; arotor, disposed in the housing, and comprising a rotor hub of a firstcylinder and a plurality of rotor blades arranged annularly and spacedlyon a periphery of the rotor hub; and a stator, disposed in the housingand located on a downstream side of the rotor, and comprising a statorhub of a second cylinder and a plurality of stator blades arrangedannularly and spacedly, each stator blade comprising a blade rootconnected to the stator hub and a blade tip located away from the statorhub; wherein, each stator blade is configured by a plurality of wingsections being stacked continuously, and a pitch angle is definedbetween a nose-tail line of each wing section and a rotation directionof the axial air moving device; and wherein, the pitch angles from theblade root to the blade tip of the wing section of each stator blade areconfigured in a manner of gradually increasing and then graduallydecreasing.
 2. The rotor-stator axial air moving device in claim 1,wherein a maximum pitch angle of the wing section of each stator bladeis located between a span position of 0.15 to the span position of 0.75.3. The rotor-stator axial air moving device in claim 1, wherein thestator hub comprises a cylinder, and the stator blades are arranged on aperiphery of the stator hub.
 4. The rotor-stator axial air moving devicein claim 1, wherein the stator blades are connected to an inner wall ofthe housing.
 5. The rotor-stator axial air moving device in claim 1,wherein the pitch angle direction of the stator blade is opposite tothat of the rotor blade.